Patents by Inventor Samuli J. Heikkilä

Samuli J. Heikkilä has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Controller for a wound rotor slip ring induction machine
    Patent number: 6741059
    Abstract: The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to control the power factor at the stator terminals of the doubly fed machine to a desired level and also to perform the task of synchronization of stator voltage to the grid voltage. An integrated controller is used to implement these three functions.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: May 25, 2004
    Assignees: ABB Automation Inc., ABB Industry Oy
    Inventors: Kalyan P. Gokhale, Douglas W. Karraker, Samuli J. Heikkilä
  • Controller for a wound rotor slip ring induction machine
    Patent number: 6448735
    Abstract: The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to control the power factor at the stator terminals of the doubly fed machine to a desired level and also to perform the task of synchronization of stator voltage to the grid voltage. An integrated controller is used to implement these three functions.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: September 10, 2002
    Assignees: ABB Automation Inc., ABB Industry Oy
    Inventors: Kalyan P. Gokhale, Douglas W. Karraker, Samuli J. Heikkilä